CN117292654A - Pixel circuit structure parameter determining method, display substrate and display - Google Patents
Pixel circuit structure parameter determining method, display substrate and display Download PDFInfo
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
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Abstract
The embodiment of the application provides a pixel circuit structure parameter determining method, a display substrate and a display, wherein the method comprises the following steps: acquiring initial design parameters of a pixel circuit, wherein the initial design parameters comprise capacitance parameters and initial distances between a data line and a pixel electrode; obtaining an expression representing the crosstalk value of the pixel according to the capacitance parameter; acquiring a crosstalk threshold value, and determining an offset interval of the pixel electrode according to the expression and the crosstalk threshold value, wherein the crosstalk threshold value represents a crosstalk value which can be tolerated by human eyes; selecting a target offset value in an offset interval of the pixel electrode; and obtaining a target distance between the data line and the pixel electrode based on the initial distance between the data line and the pixel electrode and the target offset value. By the method, the crosstalk problem in pixel display can be effectively reduced.
Description
Technical Field
The present disclosure relates to the field of electronic technologies, and in particular, to a method for determining structural parameters of a pixel circuit, a display substrate, and a display.
Background
With the continuous development of display technology, an LCD (Liquid Crystal Switch, liquid crystal display) has taken the leading role in the display industry, and ADS (advanced super-dimension Switch) has become a mainstream display mode because of the advantages of wide viewing angle, fast response speed, high contrast ratio, and the like.
In an ADS display, pixels with Column structures are asymmetric in left and right pixel electrodes, and in addition, under the condition that a process fluctuates, the pixel electrodes are offset, so that a problem of crosstalk of pixels caused by unequal Cpd capacitances (lateral field capacitances existing between a data line and the pixel electrodes) at two sides of the data line can occur, the picture display effect is affected, and further the viewing experience of a user is affected.
Therefore, how to reduce crosstalk in a pixel display is a problem to be solved.
Disclosure of Invention
An objective of the embodiments of the present application is to provide a method for determining parameters of a pixel circuit structure, a display substrate and a display, so as to reduce crosstalk in pixel display. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a method for determining a structural parameter of a pixel circuit, including:
Acquiring initial design parameters of a pixel circuit, wherein the initial design parameters comprise capacitance parameters and initial distances between a data line and a pixel electrode;
obtaining an expression representing the crosstalk value of the pixel according to the capacitance parameter;
acquiring a crosstalk threshold value, and determining an offset interval of the pixel electrode according to the expression and the crosstalk threshold value, wherein the crosstalk threshold value represents a crosstalk value which can be tolerated by human eyes;
selecting a target offset value in an offset interval of the pixel electrode;
and obtaining a target distance between the data line and the pixel electrode based on the initial distance between the data line and the pixel electrode and the target offset value.
In one possible implementation, the crosstalk values include a gray scale crosstalk value and a monochrome crosstalk value; the expression includes: a first expression of gray-scale crosstalk values and a second expression of monochromatic crosstalk values; the crosstalk threshold includes a gray-scale crosstalk value threshold and a monochrome crosstalk value threshold.
In one possible implementation, the first expression of the gray-scale crosstalk value is: Δvp1= ΔcpdΔvd/(cpd1+cpd2+cst+clc+cgp);
the second expression of the monochromatic crosstalk value is: Δvp2=cpd_avg Δvd/(cpd1+cpd2+cst+clc+cgp), cpd_avg= (cpd1+cpd2)/2;
Wherein Δcpd=cpd1-cpd2, cpd1 and Cpd2 are lateral field capacitances between the data line and the pixel electrodes on both sides, cst is a storage capacitance between the common electrode and the pixel electrode, clc is a liquid crystal capacitance, cgp is a total capacitance between the scan line and the pixel electrode, and Δvd is a voltage difference between positive and negative frames.
In one possible implementation, the first expression of the gray-scale crosstalk value is: deltaVp1≡DeltaCpd/(cst+Clc);
the second expression of the monochromatic crosstalk value is: deltaVp2≡cpd_avg DeltaVd/(cst+Clc);
wherein Δcpd=cpd1-cpd2, cpd_avg= (cpd1+cpd2)/2, cpd1 and Cpd2 are lateral field capacitances between the data line and the pixel electrodes on both sides, cst is a storage capacitance between the common electrode and the pixel electrode, clc is a liquid crystal capacitance, and Δvd is a voltage difference between positive and negative frames.
In a possible implementation manner, the acquiring the crosstalk threshold includes:
acquiring gray level difference values which can be tolerated by human eyes to obtain a first boundary gray level difference threshold value, and determining a gray level crosstalk value threshold value according to the first boundary gray level difference threshold value;
obtaining a monochromatic difference value which can be tolerated by human eyes to obtain a second boundary gray level difference threshold; and determining a monochromatic crosstalk value threshold according to the second boundary gray level difference threshold.
In one possible embodiment, the method further comprises:
according to the first expression and the gray-scale crosstalk value threshold, calculating to obtain a capacitance value range of Cst, and obtaining a first capacitance value range;
calculating to obtain a capacitance value range of Cst according to the second expression and the monochromatic crosstalk value threshold value, and obtaining a second capacitance value range;
and selecting a target capacitance value of Cst from the intersection of the first capacitance value range and the second capacitance value range.
In one possible implementation manner, the determining the offset interval of the pixel electrode according to the expression and the crosstalk threshold includes:
calculating to obtain a value range of delta Cpd according to the first expression and the gray scale crosstalk value threshold; calculating a first offset interval representing the position offset of the pixel electrode relative to the data line according to the value range of delta Cpd and the initial distance;
calculating to obtain the value range of Cpd_avg according to the second expression and the monochromatic crosstalk value threshold; according to the value range of Cpd_avg and the initial distance, calculating to obtain a second offset interval representing the position offset of the pixel electrode relative to the data line;
And calculating the intersection of the first offset interval and the second offset interval to obtain the offset interval of the pixel electrode.
In one possible implementation manner, the selecting the target offset value in the offset interval of the pixel electrode includes:
selecting a plurality of offset values to be measured in the offset interval of the pixel electrode;
measuring actual gray-scale crosstalk values and actual monochromatic crosstalk values under the offset values to be measured respectively;
and selecting a target offset value from the offset values to be measured based on the actual gray-scale crosstalk value and the actual monochromatic crosstalk value under the offset values to be measured.
In one possible implementation manner, the obtaining the target distance between the data line and the pixel electrode based on the initial distance between the data line and the pixel electrode and the target offset value includes:
on the basis of the initial distance between the data line and the pixel electrode, adjusting the distance between the data line and the pixel electrode on one side according to the target offset value to obtain the target distance between the data line and the pixel electrode;
or, based on the initial distance between the data line and the pixel electrode, adjusting the distance between the data line and the pixel electrode at two sides according to the target offset value to obtain the target distance between the data line and the pixel electrode.
In a second aspect, embodiments of the present application provide a display substrate, where the display substrate is designed by using parameters determined by a method according to any one of the first aspect of the present application.
In one possible implementation, the display substrate is a display substrate with 8k resolution, and the distances between the data lines and the pixel electrodes on two sides in the display substrate are 5.6um and 5.0um respectively.
In one possible implementation, the display substrate is a display substrate with 8k resolution, and the distances between the data lines and the pixel electrodes on two sides in the display substrate are 5.3um and 5.3um respectively.
In one possible implementation, the display substrate is a display substrate with a resolution of 4k, and the distances between the data lines and the pixel electrodes on two sides in the display substrate are 5.2um and 5.5um respectively.
In one possible implementation, the display substrate is a display substrate with a resolution of 4k, and the distances between the data lines and the pixel electrodes on two sides in the display substrate are 5.35um and 5.35um respectively.
In a third aspect, embodiments of the present application provide a display, the display including:
a display substrate as in any one of the second aspects of the present application.
The beneficial effects of the embodiment of the application are that:
the embodiment of the application provides a pixel circuit structure parameter determining method, a display substrate and a display, wherein the method comprises the following steps: acquiring initial design parameters of a pixel circuit, wherein the initial design parameters comprise capacitance parameters and initial distances between a data line and a pixel electrode; obtaining an expression representing the crosstalk value of the pixel according to the capacitance parameter; acquiring a crosstalk threshold value, and determining an offset interval of the pixel electrode according to the expression and the crosstalk threshold value, wherein the crosstalk threshold value represents a crosstalk value which can be tolerated by human eyes; selecting a target offset value in an offset interval of the pixel electrode; and obtaining a target distance between the data line and the pixel electrode based on the initial distance between the data line and the pixel electrode and the target offset value. The offset interval of the pixel electrode is obtained through the crosstalk value which can be tolerated by human eyes and the expression representing the pixel crosstalk value, and the target offset value is selected from the offset interval of the pixel electrode, so that the crosstalk problem in pixel display can be effectively reduced.
Of course, not all of the above-described advantages need be achieved simultaneously in practicing any one of the products or methods of the present application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly introduce the drawings that are required to be used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other embodiments may also be obtained according to these drawings to those skilled in the art.
FIG. 1 is a schematic diagram of a pixel array with gray level crosstalk generated in a column pixel structure according to the prior art;
FIG. 2 is a schematic diagram of a pixel array with monochromatic crosstalk for a column pixel structure according to the prior art;
fig. 3 is a schematic flow chart of a first method for determining parameters of a pixel circuit structure according to an embodiment of the present application;
fig. 4a is a schematic flow chart of a second method for determining parameters of a pixel circuit structure according to an embodiment of the present application;
FIG. 4b is a graph showing pixel electrode shift values versus crosstalk level simulation in an 8K resolution display product;
FIG. 4c is a graph showing pixel electrode shift values versus crosstalk level simulation in a 4K resolution display product;
fig. 5 is a third flowchart of a method for determining parameters of a pixel circuit structure according to an embodiment of the present application;
fig. 6 is a fourth flowchart of a method for determining parameters of a pixel circuit structure according to an embodiment of the present application;
Fig. 7 is a fifth flowchart of a method for determining parameters of a pixel circuit structure according to an embodiment of the present application;
fig. 8 is a sixth flowchart of a method for determining parameters of a pixel circuit structure according to an embodiment of the present application;
FIG. 9 is a graph comparing pixel electrode misalignment before and after 8K resolution display products;
fig. 10 is a graph comparing the pixel electrode shift before and after the pixel electrode shift for a 4K resolution display product.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. Based on the embodiments herein, a person of ordinary skill in the art would be able to obtain all other embodiments based on the disclosure herein, which are within the scope of the disclosure herein.
First, a cross-talk problem occurring in a display of the related art will be briefly described.
Fig. 1 is a schematic diagram of a pixel array in which gray-scale crosstalk occurs in a column pixel structure in the prior art. As shown in fig. 1, D1-D7 are data lines in the pixel structure, and G1-G4 are gate voltage scan lines in the pixel structure; pixel electrodes (the shape of the pixel electrodes can be irregular patterns) are arranged on the left side and the right side of the data line, and the arrangement mode of the pixel electrodes is a column inversion mode, namely each pixel electrode has the same polarity with the adjacent pixel electrodes on the column, and has opposite polarity with the adjacent pixel electrodes on the row; the polarity of the pixel electrode is changed when the picture data is changed next time, that is, the polarity is changed continuously for the same pixel electrode. The structure also comprises a TFT (Thin Film Transistor, thin film field effect transistor), wherein the grid electrode of the TFT is electrically connected with the grid voltage scanning line, the drain electrode of the TFT is electrically connected with the data line, and the source electrode of the TFT is electrically connected with the pixel electrode. The TFT tube has the function that each liquid crystal pixel point on the liquid crystal display is driven by the TFT tube integrated behind the liquid crystal pixel point, so that screen information can be displayed at high speed, high brightness and high contrast. The TFT is an N-type TFT, when the grid voltage is high, the TFT of the pixel is started, and the data line loads a voltage signal into the pixel electrode; when the gate voltage is at a low level, the TFT is turned off, and the storage capacitance between the pixel electrode and the common electrode allows the voltage value in the pixel electrode to be maintained until the next frame. Vcom represents the voltage of the common electrode.
In practical applications, the N-type TFT may be replaced by an NMOS (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET, metal-Oxide-semiconductor field effect transistor).
Lateral field capacitances exist between the data lines and the pixel electrodes on the left and right sides, so to speak, between the pixel electrodes and the data lines on the left and right sides, that is, cpd1 and Cpd2.
Taking the D2 data line as an example, when the frame is displayed in the nth frame, the data line voltage jumps from the L127 gray-scale voltage (negative polarity) to the L255 gray-scale voltage (negative polarity), the pixel voltage in the (1) region is pulled due to the presence of the Cpd1 and Cpd2 capacitors, the voltage difference between the pixel voltage (the voltage of the pixel electrode) and the common voltage Vcom increases, and the pixel is bright. When the data line voltage jumps from the L255 gray scale voltage to the L127 gray scale voltage, the pixel voltage of the (3) region is pulled, the voltage difference between the pixel voltage and the common voltage Vcom decreases, and the pixel is darker. The voltage jump direction of the D3 data line is opposite to D2. If Cpd capacitances at the left and right sides of the pixel electrode are equal in size, the pulling effect of the data line on the pixel electrode is equal, opposite in polarity and mutually offset, and the crosstalk problem does not occur. When the pixel electrodes on the left and right sides of the data line are asymmetric or have misalignment (the position of the pixel electrode is offset relative to the data line), the Cpd1 and Cpd2 are different, the cpd1 is not equal to Cpd2, and at this time, the crosstalk problem occurs, so that the picture display effect is affected, and further the viewing experience of the user is affected.
Fig. 2 is a schematic diagram of a pixel array in which monochromatic crosstalk occurs in a column pixel structure according to the prior art. The structure is the same as that of fig. 1, and will not be described again here. Because the voltage jumps of the data lines of D2 and D3 will cause the pixel electrodes to jump in the same direction, the voltage difference between the pixel electrodes and the common voltage Vcom increases or decreases simultaneously, the crosstalk problem will be more serious, and the human eye is more sensitive to the green picture ((2) region pixels are green), and the perceived crosstalk problem will be more obvious.
In order to reduce crosstalk problems in pixel display, the embodiment of the application provides a pixel circuit structure parameter determining method, a display substrate and a display.
Next, a detailed description is given of a method for determining parameters of a pixel circuit structure according to an embodiment of the present application, referring to fig. 3, including the following steps:
step S301: acquiring initial design parameters of a pixel circuit, wherein the initial design parameters comprise capacitance parameters and initial distances between a data line and a pixel electrode;
the method for obtaining the initial design parameters of the pixel circuit can refer to the design method of the pixel circuit parameters in the prior art, is not particularly limited in the application, and the embodiment of the application is used for further reducing the crosstalk problem of the pixel display on the basis of the initial design parameters of the pixel circuit. The capacitance parameters include initial relevant parameters of Cpd1 and Cpd2, and may also include parameters of storage capacitance between the common electrode and the pixel electrode, liquid crystal capacitance, total capacitance between the scanning line and the pixel electrode, and the like; the initial distance between the data line and the pixel electrode includes initial distances between the data line and the pixel electrodes on the left and right sides, respectively.
Step S302: obtaining an expression representing the crosstalk value of the pixel according to the capacitance parameter;
as can be seen from the above analysis, the crosstalk value is due to the difference between Cpd1 and Cpd2, and therefore an expression of the crosstalk value of the pixel can be calculated based on the capacitance parameter. In one example, the crosstalk value of the pixel may be a gray crosstalk value, in one example, the crosstalk value of the pixel may be a color crosstalk value, and in one example, the crosstalk value of the pixel may include a gray crosstalk value and a color crosstalk value.
Step S303: acquiring a crosstalk threshold value, and determining an offset interval of the pixel electrode according to the expression and the crosstalk threshold value, wherein the crosstalk threshold value represents a crosstalk value which can be tolerated by human eyes;
the crosstalk threshold represents a crosstalk value which can be tolerated by the human eye, that is, when the crosstalk value is smaller than the crosstalk threshold, the human eye does not feel obvious pixel crosstalk phenomenon, and according to the expression of the crosstalk value of the pixel and the crosstalk threshold, an adjustment interval of the pixel electrode position, that is, an offset interval of the pixel electrode, can be calculated.
Step S304: selecting a target offset value in an offset interval of the pixel electrode;
the target offset value may be a distance value by which the position of the pixel electrode is offset from the initial pixel electrode when the crosstalk value is minimum. In one example, the target offset value may be selected in the offset interval by a point-by-point test, specifically, a unit step length may be set, in the offset interval, the crosstalk value of the pixel is tested point by point from the end point of the interval by adjusting the distance of the unit step length each time, so as to obtain the offset value when the crosstalk value is minimum in the test result, that is, the target offset value.
Step S305: and obtaining a target distance between the data line and the pixel electrode based on the initial distance between the data line and the pixel electrode and the target offset value.
In the embodiment of the application, initial design parameters of the pixel circuit are obtained, wherein the initial design parameters comprise capacitance parameters and initial distances between the data lines and the pixel electrodes; obtaining an expression for representing the crosstalk value of the pixel according to the capacitance parameter; acquiring a crosstalk threshold value, and determining an offset interval of a pixel electrode according to the expression and the crosstalk threshold value; selecting a target offset value in an offset interval of the pixel electrode; and obtaining the target distance between the data line and the pixel electrode based on the initial distance between the data line and the pixel electrode and the target offset value. The offset interval of the pixel electrode is obtained through the crosstalk value which can be tolerated by human eyes and the expression representing the pixel crosstalk value, and the target offset value is selected from the offset interval of the pixel electrode, so that the crosstalk problem in pixel display can be effectively reduced.
In one possible implementation, the crosstalk values include a gray scale crosstalk value and a monochrome crosstalk value; the expression includes: a first expression of gray-scale crosstalk values and a second expression of monochromatic crosstalk values; the crosstalk threshold includes a gray-scale crosstalk value threshold and a monochrome crosstalk value threshold.
In one possible implementation, the first expression of the gray-scale crosstalk value is: Δvp1= ΔcpdΔvd/(cpd1+cpd2+cst+clc+cgp);
the second expression of the monochromatic crosstalk value is: Δvp2=cpd_avg Δvd/(cpd1+cpd2+cst+clc+cgp), cpd_avg= (cpd1+cpd2)/2;
wherein Δcpd=cpd1-cpd2, cpd1 and Cpd2 are lateral field capacitances between the data line and the pixel electrodes on both sides, cst is a storage capacitance between the common electrode and the pixel electrode, clc is a liquid crystal capacitance, cgp is a total capacitance between the scan line and the pixel electrode, and Δvd is a voltage difference between positive and negative frames.
In one possible implementation, the first expression of the gray-scale crosstalk value is: deltaVp1≡DeltaCpd/(cst+Clc);
the second expression of the monochromatic crosstalk value is: deltaVp2≡cpd_avg DeltaVd/(cst+Clc);
wherein Δcpd=cpd1-cpd2, cpd_avg= (cpd1+cpd2)/2, cpd1 and Cpd2 are lateral field capacitances between the data line and the pixel electrodes on both sides, cst is a storage capacitance between the common electrode and the pixel electrode, clc is a liquid crystal capacitance, and Δvd is a voltage difference between positive and negative frames.
To sum up, the first expression of the gray-scale crosstalk value is: Δvp1= Δvd/(cpd1+cpd2+cst+clc+cgp) ≡Δcpd/(cst+clc); the second expression for the monochromatic crosstalk value is: Δvp2=cpd_avg Δvd/(cpd1+cpd2+cst+clc+cgp) ≡cpd_avg Δvd/(cst+clc). The voltage difference of the pixel voltage relative to the common voltage is DeltaV, deltaVp is a jump value of the pixel voltage relative to DeltaV, and the jump value is used for representing the crosstalk value; the crosstalk value Δvp is closer to zero, which means that no crosstalk occurs when Δvp=0 as the crosstalk is smaller.
In this embodiment, in the expression of the gray-scale/monochrome crosstalk value described above, the capacitance value of Clc is much smaller than Cst by at least one order of magnitude smaller than that of Cst, so in cst+clc Clc, clc is negligible, Δvd is a constant value, and Cst is kept unchanged as a constant value in the expression having the relationship between Cpd1 and Cpd2 (Δcpd or cpd_avg) as a unique variable. Thus, the crosstalk value Δvp is related to only the changes in Cpd1 and Cpd 2.
In a possible implementation, referring to fig. 4a, the acquired crosstalk threshold in step S303 of fig. 3 is refined, comprising the steps of:
step S401: acquiring gray level difference values which can be tolerated by human eyes to obtain a first boundary gray level difference threshold value, and determining a gray level crosstalk value threshold value according to the first boundary gray level difference threshold value;
step S402: obtaining a monochromatic difference value which can be tolerated by human eyes to obtain a second boundary gray level difference threshold; and determining a monochromatic crosstalk value threshold according to the second boundary gray level difference threshold.
In one example, when the human eye observes the gray-scale crosstalk picture, the human eye can obviously observe the picture difference when the gray-scale difference of the boundary L127 is more than 2, and the level is not acceptable; when the L127 boundary gray-scale difference is less than 2, the human eye cannot observe the picture difference obviously, and the level is acceptable. When the human eyes observe monochromatic crosstalk pictures (green, human eyes are sensitive to green), when the gray level difference of the boundary L127 is more than 6, the human eyes can obviously observe the picture difference, and the level is not acceptable; when the gray level difference of the L127 boundary is smaller than 6, the human eyes cannot obviously observe the picture difference, and the level is acceptable.
The delta Vd is a voltage difference value between positive and negative frames, which is a set fixed value, the initial design parameters can also comprise the voltage difference value between the positive and negative frames, and under the condition that the delta Vd is a preset fixed value, a first boundary gray level difference threshold value when the boundary gray level difference is 2 under the gray level crosstalk condition can be calculated; and calculating a second boundary gray level difference threshold value when the boundary gray level difference is 6 under the condition of monochromatic crosstalk.
According to the simulation curves of the offset value of the gray-scale pixel electrode and the crosstalk level, as shown in fig. 4b and 4c, three curves in fig. 4b are three different simulation curves of the offset value of the pixel electrode and the crosstalk level in the 8K resolution display product respectively, wherein the abscissa represents the offset value of the pixel electrode and the ordinate represents the crosstalk level; fig. 4c is a simulation curve of the pixel electrode offset value-crosstalk level in a 4K resolution display product, the abscissa represents the pixel electrode offset value, the ordinate represents the crosstalk level, the slope refers to the value of the crosstalk level/pixel electrode offset value, and 2ito to SD x/y refer to the distances between the data lines and the pixel electrodes on both sides, respectively. When the gray-scale crosstalk value DeltaVp 1 is smaller than or equal to the first boundary gray-scale difference threshold, the human eyes can not obviously observe the picture difference, and can be regarded as no crosstalk; given Δvd, Δcpd/(cst+clc) corresponds to less than or equal to a first threshold value, where the first threshold value = first boundary gray level difference threshold/Δvd. In one example, when the first threshold is equal to 0.006, i.e., Δcpd/(cst+clc). Ltoreq.0.006, no crosstalk occurs and the gray scale image is good.
According to the analog curve of the single-color pixel electrode offset value-crosstalk level, the curve analysis is the same as the gray level, and the description is omitted here. When the monochromatic crosstalk value delta Vp2 is smaller than or equal to the second boundary gray level difference threshold value, no crosstalk occurs; given Δvd, cpd_avg/(cst+clc) corresponds to less than or equal to a second threshold value, where the second threshold value = second boundary gray level difference threshold/Δvd. In one example, when the second threshold is equal to 0.009, i.e., cpd_avg/(cst+Clc). Ltoreq.0.009, no crosstalk occurs and the monochrome picture performs well.
In the embodiment of the application, a gray level difference value which can be tolerated by human eyes is obtained to obtain a first boundary gray level difference threshold value, and a gray level crosstalk value threshold value is determined according to the first boundary gray level difference threshold value; obtaining a monochromatic difference value which can be tolerated by human eyes to obtain a second boundary gray level difference threshold; and determining a monochromatic crosstalk value threshold according to the second boundary gray level difference threshold. The gray level/monochromatic crosstalk value threshold is obtained through the gray level difference value which can be tolerated by human eyes, and the gray level crosstalk value threshold is equal to 0.006, namely, when delta Cpd/(cst+Clc) is less than or equal to 0.006, the human eyes cannot perceive the occurrence of gray level crosstalk, and gray level images are good in performance; when the threshold value of the monochromatic crosstalk value is equal to 0.009, namely Cpd_avg/(cst+Clc) is less than or equal to 0.009, the occurrence of crosstalk cannot be perceived by human eyes, and the monochromatic picture is good in performance. The crosstalk problem in the pixel display can be effectively reduced.
Referring to fig. 5, a third flowchart of a method for determining a pixel circuit structural parameter according to an embodiment of the present application is provided, and in one possible implementation manner, the method for determining a pixel circuit structural parameter according to an embodiment of the present application further includes the following steps:
step S501: according to the first expression and the gray-scale crosstalk value threshold, calculating to obtain a capacitance value range of Cst, and obtaining a first capacitance value range;
step S502: calculating to obtain a capacitance value range of Cst according to the second expression and the monochromatic crosstalk value threshold value, and obtaining a second capacitance value range;
step S503: and selecting a target capacitance value of Cst from the intersection of the first capacitance value range and the second capacitance value range.
In one example, in the above expression of the gray-scale/monochrome crosstalk value, the first expression of the gray-scale crosstalk value is: deltaVp1≡DeltaCpd/(cst+Clc); the second expression for the monochromatic crosstalk value is: deltaVp2≡cpd_avg DeltaVd/(cst+Clc); where Δcpd=cpd1-cpd2, cpd_avg= (cpd1+cpd2)/2. Clc is negligible compared to Cst, Δvd is a constant value, and Cpd1 and Cpd2 are kept unchanged in an expression with Cst as the only variable, and are used as quantification. Therefore, the crosstalk values Δvp1 and Δvp2 are related to only the change in Cst. In gray-scale crosstalk, the delta Cpd/(cst+Clc) is less than or equal to 0.006, a first capacitance value range of the Cst capacitance can be calculated, and in monochromatic crosstalk, the Cpd_avg/(cst+Clc) is less than or equal to 0.009, a second capacitance value range of the Cst capacitance can be calculated. Intersection of the first capacitance value range and the second capacitance value range can obtain the value range of the Cst capacitance; after the value range of the Cst capacitor is obtained, a proper Cst capacitor value can be selected according to different actual product requirements, so that the crosstalk value of pixel display is reduced on the basis of meeting product requirements.
In one example, in gray scale display of 8K resolution display products, cst is generally required to be less than 0.5pF, and when the value of Cst is 0.16pF in combination with the value range of Cst, the value of Cst is more suitable; in gray scale display of 4K resolution display products, cst is generally required to be greater than 1.0pF, and when the value of Cst is 1.25pF, the value of Cst is combined with the value range of Cst.
In the embodiment of the application, according to a first expression and a gray-scale crosstalk value threshold, calculating to obtain a capacitance value range of Cst, and obtaining a first capacitance value range; calculating to obtain a capacitance value range of Cst according to the second expression and the monochromatic crosstalk value threshold value, and obtaining a second capacitance value range; and selecting the target capacitance value of Cst in the intersection of the first capacitance value range and the second capacitance value range, and correspondingly increasing the Cst in the appropriate Cst value range to reduce the crosstalk value delta Vp, thereby effectively reducing the crosstalk problem in pixel display.
Referring to fig. 6, the determining the offset interval of the pixel electrode according to the expression and the crosstalk threshold in step S303 of fig. 3 is refined, and includes the following steps:
step S601: calculating to obtain a value range of delta Cpd according to the first expression and the gray scale crosstalk value threshold; calculating a first offset interval representing the position offset of the pixel electrode relative to the data line according to the value range of delta Cpd and the initial distance;
Step S602: calculating to obtain the value range of Cpd_avg according to the second expression and the monochromatic crosstalk value threshold; according to the value range of Cpd_avg and the initial distance, calculating to obtain a second offset interval representing the position offset of the pixel electrode relative to the data line;
step S603: and calculating the intersection of the first offset interval and the second offset interval to obtain the offset interval of the pixel electrode.
In one example, in the above expression of the gray-scale/monochrome crosstalk value, the first expression of the gray-scale crosstalk value is: deltaVp1≡DeltaCpd/(cst+Clc); the second expression for the monochromatic crosstalk value is: deltaVp2≡cpd_avg DeltaVd/(cst+Clc); where Δcpd=cpd1-cpd2, cpd_avg= (cpd1+cpd2)/2. Clc is negligible compared to Cst, Δvd is a constant value, and Cst is kept unchanged as a quantitative value in an expression having the relationship between Cpd1 and Cpd2 (Δcpd or cpd_avg) as a unique variable. Thus, the crosstalk value Δvp is related to only the changes in Cpd1 and Cpd 2.
In the gray-scale crosstalk, Δcpd/(cst+clc) is smaller than or equal to a first critical value, where a value range of Δcpd may be calculated, where Δcpd=cpd1-cpd2, where, in the case of determining Cpd1 and Cpd2 materials and processes, the size of the Cpd1 capacitor is only related to the distance between two plates of Cpd1, and the size of the Cpd2 capacitor is only related to the distance between two plates of Cpd2, so Cpd1 and Cpd2 are parameters related to the distance between the data line and the pixel electrodes on both sides, that is, the size of Δcpd is only related to the distance between the data line and the pixel electrodes on both sides. And determining the distance range between the data line and the pixel electrodes at the two sides based on the value range of delta Cpd, and obtaining the offset interval of the pixel electrode relative to the data line according to the initial distance between the data line and the pixel electrodes at the two sides.
In the monochromatic crosstalk, cpd_avg/(cst+clc) is smaller than or equal to a second critical value, and at this time, the value range of cpd_avg can be calculated; the Cpd1 and Cpd2 are parameters related to the distance between the data line and the pixel electrodes at two sides, the distance range between the data line and the pixel electrodes at two sides is determined based on the value range of Cpd_avg, and then the offset interval of the pixel electrode relative to the data line is obtained according to the initial distance between the data line and the pixel electrodes at two sides.
In the embodiment of the application, according to the first expression and the gray-scale crosstalk value threshold, calculating to obtain a value range of delta Cpd; calculating a first offset interval representing the position offset of the pixel electrode relative to the data line according to the value range of delta Cpd and the initial distance; according to the second expression and the monochromatic crosstalk value threshold, calculating to obtain the value range of Cpd_avg; calculating a second offset interval representing the position offset of the pixel electrode relative to the data line according to the value range and the initial distance of Cpd_avg; and calculating the intersection of the first offset interval and the second offset interval to obtain the offset interval of the pixel electrode. Cpd1 and Cpd2 are parameters related to the distance between the data line and the pixel electrodes at two sides, the distance range between the data line and the pixel electrodes at two sides can be determined based on the value range of delta Cpd or Cpd_avg, and then the offset interval of the pixel electrode relative to the data line, namely the offset interval when no crosstalk occurs, is obtained according to the initial distance between the data line and the pixel electrodes at two sides, so that the crosstalk problem in pixel display can be effectively reduced.
In a possible implementation, referring to fig. 7, step S304 in fig. 3 is refined, including the following steps:
step S701: selecting a plurality of offset values to be measured in the offset interval of the pixel electrode;
step S702: measuring actual gray-scale crosstalk values and actual monochromatic crosstalk values under the offset values to be measured respectively;
step S703: and selecting a target offset value from the offset values to be measured based on the actual gray-scale crosstalk value and the actual monochromatic crosstalk value under the offset values to be measured.
In one example, in the gray-scale crosstalk, in an offset interval of the pixel electrode relative to the data line, testing an actual gray-scale crosstalk value under each offset value according to a preset first unit step length, and selecting a corresponding offset value when the actual gray-scale crosstalk value is minimum to obtain a first target offset value; in the single-color crosstalk, in an offset interval of the pixel electrode relative to the data line, testing an actual single-color crosstalk value under each offset value according to a preset second unit step length, and selecting an offset value corresponding to the minimum actual single-color crosstalk value to obtain a second target offset value.
In the embodiment of the application, a plurality of offset values to be measured are selected in the offset interval of the pixel electrode; measuring actual gray-scale crosstalk values and actual monochromatic crosstalk values under the offset values to be measured respectively; and selecting a target offset value from the offset values to be measured based on the actual gray-scale crosstalk value and the actual monochromatic crosstalk value under the offset values to be measured. And selecting a target offset value in the offset interval of the pixel electrode, namely selecting a target value of which the position of the pixel electrode is offset relative to the initial pixel electrode when the crosstalk value is minimum, so that the difference between the distances between the data lines and the pixel electrodes at two sides can be effectively reduced, and the crosstalk problem in pixel display is reduced.
In a possible implementation, referring to fig. 8, step S305 in fig. 3 is refined, including the following steps:
step S801: on the basis of the initial distance between the data line and the pixel electrode, adjusting the distance between the data line and the pixel electrode on one side according to the target offset value to obtain the target distance between the data line and the pixel electrode;
step S802: or, based on the initial distance between the data line and the pixel electrode, adjusting the distance between the data line and the pixel electrode at two sides according to the target offset value to obtain the target distance between the data line and the pixel electrode.
In one example, the adjustment method of the target offset value of the pixel electrode includes: single-side adjustment and two-side adjustment;
in the gray-scale crosstalk, the offset value adjusted at one side is the first target offset value, and the single side of the pixel electrode which is closer to one side of the data line is contracted by the first target offset value based on the unequal distance between the pixel electrodes at two sides of the data line, so that the distance between the pixel electrodes at two sides of the data line is changed from unequal to approximately equal, and the delta Cpd is reduced; and the offset value of the bilateral adjustment is half of the first target offset value, and based on the unequal distance between the pixel electrodes at the two sides of the data line, the single sides of the pixel electrodes at the two sides of the data line are respectively retracted by half of the first target offset value, so that the distance between the pixel electrodes at the two sides of the data line is changed from unequal to approximately equal, and the delta Cpd is reduced.
In the monochromatic crosstalk, the offset value adjusted at one side is the second target offset value, and the single side of the pixel electrode which is closer to one side of the data line is contracted inwards by the second target offset value, so that the Cpd_avg is reduced; and the offset value of the bilateral adjustment is half of the second target offset value, and the single sides of the pixel electrodes at the two sides of the data line are respectively shrunk by half of the second target offset value, so that the Cpd_avg is reduced.
In the embodiment of the application, on the basis of the initial distance between the data line and the pixel electrode, the distance between the data line and the pixel electrode on one side is adjusted according to the target offset value, so that the target distance between the data line and the pixel electrode is obtained; or, based on the initial distance between the data line and the pixel electrode, adjusting the distance between the data line and the pixel electrodes at two sides according to the target offset value to obtain the target distance between the data line and the pixel electrode. The target offset value adjustment method of the pixel electrode comprises the following steps: single-side adjustment and two-side adjustment; in gray scale crosstalk, the offset value adjusted at one side is a first target offset value, and the single side of the pixel electrode which is closer to one side of the data line is retracted by the first target offset value based on the unequal distance between the data line and the pixel electrodes at two sides, so that the distance between the data line and the pixel electrodes at two sides is changed from unequal to approximately equal, and delta Cpd is reduced; the offset value of the bilateral adjustment is half of the first target offset value, and the single sides of the pixel electrodes on the two sides of the data line are respectively retracted by half of the first target offset value based on the unequal distance between the data line and the pixel electrodes on the two sides, so that the distance between the data line and the pixel electrodes on the two sides is changed from unequal to approximately equal, and delta Cpd is reduced; in the monochromatic crosstalk, the offset value adjusted at one side is a second target offset value, and the single side of the pixel electrode which is closer to one side of the data line is retracted by the second target offset value, so that Cpd_avg is reduced; and the offset value of the bilateral adjustment is half of the second target offset value, and the single sides of the pixel electrodes at the two sides of the data line are respectively retracted by half of the second target offset value, so that Cpd_avg is reduced. The crosstalk problem in the pixel display can be effectively reduced.
The embodiment of the application also provides a display substrate, which is obtained by designing the parameters determined by the method.
In one possible implementation, the display substrate is a display substrate with 8k resolution, and the distances between the data lines and the pixel electrodes on two sides in the display substrate are 5.6um and 5.0um respectively.
In one possible implementation, the display substrate is a display substrate with 8k resolution, and the distances between the data lines and the pixel electrodes on two sides in the display substrate are 5.3um and 5.3um respectively.
In one example, FIG. 9 is a graph comparing pixel electrode misalignment before and after 8K resolution display product. In the pixel reference structure, the distances between the data lines and the pixel electrodes are 5.0um and 5.0um, respectively. After the pixel electrode is unilaterally retracted by 0.6um (the pixel electrode at the left side of the data line is retracted), the distance between the data line and the pixel electrode is 5.6um and 5.0um respectively. After the pixel electrodes on two sides of the data line are unilaterally contracted by 0.3um, the distance between the data line and the pixel electrode is 5.3um and 5.3um respectively. Wherein, the 1ITO layer is a pixel electrode, and the 2ITO layer is a common electrode.
In one possible implementation, the display substrate is a display substrate with a resolution of 4k, and the distances between the data lines and the pixel electrodes on two sides in the display substrate are 5.2um and 5.5um respectively.
In one possible implementation, the display substrate is a display substrate with a resolution of 4k, and the distances between the data lines and the pixel electrodes on two sides in the display substrate are 5.35um and 5.35um respectively.
In one example, FIG. 10 is a graph showing a comparison of the pixel electrode shift before and after a 4K resolution display product. In the pixel reference structure, the distances between the data lines and the pixel electrodes are 5.2um and 5.2um respectively. After the pixel electrode is unilaterally retracted by 0.3um (the pixel electrode on the right side of the data line is retracted), the distance between the data line and the pixel electrode is 5.2um and 5.5um respectively. After the pixel electrodes on two sides of the data line are unilaterally contracted by 0.15um, the distances between the data line and the pixel electrodes are 5.35um and 5.35um respectively. Wherein, 1ITO layer is the common electrode, and 2ITO layer is the pixel electrode.
In the embodiment of the application, in the pixel reference structure of the 8K resolution display product, the distance between the data line and the pixel electrode is 5.0um and 5.0um respectively. After the pixel electrode is unilaterally retracted by 0.6um (the pixel electrode at the left side of the data line is retracted), the distance between the data line and the pixel electrode is 5.6um and 5.0um respectively. After the pixel electrodes on two sides of the data line are unilaterally contracted by 0.3um, the distance between the data line and the pixel electrode is 5.3um and 5.3um respectively. In the pixel reference structure of the 4K resolution display product, the distances between the data line and the pixel electrode are 5.2um and 5.2um respectively. After the pixel electrode is unilaterally retracted by 0.3um (the pixel electrode on the right side of the data line is retracted), the distance between the data line and the pixel electrode is 5.2um and 5.5um respectively. After the pixel electrodes on two sides of the data line are unilaterally contracted by 0.15um, the distances between the data line and the pixel electrodes are 5.35um and 5.35um respectively. For example, in the gray crosstalk of the 8K resolution display product, the offset value adjusted on one side is 0.6um, and the single side of the pixel electrode closer to one side of the data line is retracted by the first target offset value based on the unequal distance between the data line and the pixel electrodes on two sides, so that the distance between the data line and the pixel electrodes on two sides is changed from unequal to approximately equal, and Δcpd is reduced; the offset value of the bilateral adjustment is 0.3um of the first target offset value, and based on the unequal distance between the data line and the pixel electrodes at the two sides, the single sides of the pixel electrodes at the two sides of the data line are respectively retracted by half of the first target offset value, so that the distance between the data line and the pixel electrodes at the two sides is changed from unequal to approximately equal, and delta Cpd is reduced; the crosstalk problem in the pixel display can be effectively reduced.
The embodiment of the application also provides a display, which comprises the display substrate.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application. Any modifications, equivalent substitutions, improvements, etc. that are within the spirit and principles of the present application are intended to be included within the scope of the present application.
Claims (15)
1. A method for determining parameters of a pixel circuit structure, the method comprising:
acquiring initial design parameters of a pixel circuit, wherein the initial design parameters comprise capacitance parameters and initial distances between a data line and a pixel electrode;
obtaining an expression representing the crosstalk value of the pixel according to the capacitance parameter;
acquiring a crosstalk threshold value, and determining an offset interval of the pixel electrode according to the expression and the crosstalk threshold value, wherein the crosstalk threshold value represents a crosstalk value which can be tolerated by human eyes;
selecting a target offset value in an offset interval of the pixel electrode;
and obtaining a target distance between the data line and the pixel electrode based on the initial distance between the data line and the pixel electrode and the target offset value.
2. The method of claim 1, wherein the crosstalk values comprise gray scale crosstalk values and monochrome crosstalk values; the expression includes: a first expression of gray-scale crosstalk values and a second expression of monochromatic crosstalk values; the crosstalk threshold includes a gray-scale crosstalk value threshold and a monochrome crosstalk value threshold.
3. The method of claim 2, wherein the first expression of the gray-scale crosstalk value is: Δvp1= ΔcpdΔvd/(cpd1+cpd2+cst+clc+cgp);
the second expression of the monochromatic crosstalk value is: Δvp2=cpd_avg Δvd/(cpd1+cpd2+cst+clc+cgp), cpd_avg= (cpd1+cpd2)/2;
wherein Δcpd=cpd1-cpd2, cpd1 and Cpd2 are lateral field capacitances between the data line and the pixel electrodes on both sides, cst is a storage capacitance between the common electrode and the pixel electrode, clc is a liquid crystal capacitance, cgp is a total capacitance between the scan line and the pixel electrode, and Δvd is a voltage difference between positive and negative frames.
4. The method of claim 2, wherein the first expression of the gray-scale crosstalk value is: deltaVp1≡DeltaCpd/(cst+Clc);
the second expression of the monochromatic crosstalk value is: deltaVp2≡cpd_avg DeltaVd/(cst+Clc);
wherein Δcpd=cpd1-cpd2, cpd_avg= (cpd1+cpd2)/2, cpd1 and Cpd2 are lateral field capacitances between the data line and the pixel electrodes on both sides, cst is a storage capacitance between the common electrode and the pixel electrode, clc is a liquid crystal capacitance, and Δvd is a voltage difference between positive and negative frames.
5. The method according to claim 3 or 4, wherein the obtaining a crosstalk threshold comprises:
Acquiring gray level difference values which can be tolerated by human eyes to obtain a first boundary gray level difference threshold value, and determining a gray level crosstalk value threshold value according to the first boundary gray level difference threshold value;
obtaining a monochromatic difference value which can be tolerated by human eyes to obtain a second boundary gray level difference threshold; and determining a monochromatic crosstalk value threshold according to the second boundary gray level difference threshold.
6. The method of claim 5, wherein the method further comprises:
according to the first expression and the gray-scale crosstalk value threshold, calculating to obtain a capacitance value range of Cst, and obtaining a first capacitance value range;
calculating to obtain a capacitance value range of Cst according to the second expression and the monochromatic crosstalk value threshold value, and obtaining a second capacitance value range;
and selecting a target capacitance value of Cst from the intersection of the first capacitance value range and the second capacitance value range.
7. The method of claim 5, wherein determining the offset interval of the pixel electrode according to the expression and the crosstalk threshold comprises:
calculating to obtain a value range of delta Cpd according to the first expression and the gray scale crosstalk value threshold; calculating a first offset interval representing the position offset of the pixel electrode relative to the data line according to the value range of delta Cpd and the initial distance;
Calculating to obtain the value range of Cpd_avg according to the second expression and the monochromatic crosstalk value threshold; according to the value range of Cpd_avg and the initial distance, calculating to obtain a second offset interval representing the position offset of the pixel electrode relative to the data line;
and calculating the intersection of the first offset interval and the second offset interval to obtain the offset interval of the pixel electrode.
8. The method of claim 2, wherein selecting the target offset value in the offset interval of the pixel electrode comprises:
selecting a plurality of offset values to be measured in the offset interval of the pixel electrode;
measuring actual gray-scale crosstalk values and actual monochromatic crosstalk values under the offset values to be measured respectively;
and selecting a target offset value from the offset values to be measured based on the actual gray-scale crosstalk value and the actual monochromatic crosstalk value under the offset values to be measured.
9. The method of claim 1, wherein the obtaining the target distance between the data line and the pixel electrode based on the initial distance between the data line and the pixel electrode and the target offset value comprises:
On the basis of the initial distance between the data line and the pixel electrode, adjusting the distance between the data line and the pixel electrode on one side according to the target offset value to obtain the target distance between the data line and the pixel electrode;
or, based on the initial distance between the data line and the pixel electrode, adjusting the distance between the data line and the pixel electrode at two sides according to the target offset value to obtain the target distance between the data line and the pixel electrode.
10. A display substrate characterized by being designed by parameters determined by the method of any one of claims 1-9.
11. The display substrate according to claim 10, wherein the display substrate is a display substrate with a resolution of 8k, and the distances between the data lines and the pixel electrodes on both sides in the display substrate are 5.6um and 5.0um, respectively.
12. The display substrate of claim 10, wherein the display substrate is an 8k resolution display substrate, and the distances between the data lines and the pixel electrodes on both sides in the display substrate are 5.3um and 5.3um, respectively.
13. The display substrate according to claim 10, wherein the display substrate is a 4k resolution display substrate, and the distances between the data lines and the pixel electrodes on both sides in the display substrate are 5.2um and 5.5um, respectively.
14. The display substrate according to claim 10, wherein the display substrate is a 4k resolution display substrate, and the distances between the data lines and the pixel electrodes on both sides in the display substrate are 5.35um and 5.35um, respectively.
15. A display comprising the display substrate of any one of claims 10-14.
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| CN202210688812.4A CN117292654A (en) | 2022-06-16 | 2022-06-16 | Pixel circuit structure parameter determining method, display substrate and display |
| PCT/CN2023/096876 WO2023241342A1 (en) | 2022-06-16 | 2023-05-29 | Pixel circuit structure parameter determination method, display substrate, and display |
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| CN111090203B (en) * | 2020-03-22 | 2020-07-14 | 深圳市华星光电半导体显示技术有限公司 | Array substrate and display panel |
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